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Can I have the same left navigation bar at SharePoint 2013 on all the subsites and site collections?
If it's not possible, can I do it with the navigation bar/Banner?
I'd like to use the same (default) menu on all of the SharePoint sites.
It can be done but the best would be to keep the Top Navigation the same across your entire site and have left/quick navigation site specific.
Customising both would be done by branding your site.
Read the below articles:
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